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TI-2021-19648 Aliases CVE-2021-43842

Stored XSS via SVG file upload in Wiki.js

Priority LOW 26CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258.

Why it matters now

EPSS 0.00744 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Requarkswiki< 2.5.258 (development); < 2.5.260 (production)—No fix listedCNA
  • wiki VendorRequarks Affected < 2.5.258 (development); < 2.5.260 (production) Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:*up to 2.5.257VulnerableRequarks
  • cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:* Versions up to 2.5.257 Vulnerable ·Requarks

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43842

References

Patch 2

Advisory 1

  • TI-2026-32203 Wiki.js: Privilege Escalation via Missing Group Validation in users.update CVSS 4.0HIGH 8.6
  • TI-2021-07999 Requarks wiki.js - Stored Cross-Site Scripting (XSS) in markdown editor CVSS 3.1MEDIUM 5.4
  • TI-2025-35387 Requarks Wiki.js 2.5.307 does not properly revoke or invalidate active JWT tokens when a… CVSS 3.1CRITICAL 9.1
  • TI-2020-12008 Directory Traversal in Wiki.js CVSS 3.1HIGH 8.6
  • TI-2022-07706 Improper write access check in Requarks/wiki CVSS 3.1HIGH 8.1
  • TI-2021-19662 Stored XSS in non-image uploads in Requarks/wiki CVSS 3.1HIGH 8.2
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences